Hello there,
I believe the reason that crates aren’t implemented on Creative, is because they wouldn’t add much into the gamemode. As well as this, there are many, many possible issues that can arise from this, such as duplicating keys, keys being cleared when players clear their inventories, so on and so forth.
Due to this, I don’t believe the typical crate system will be implemented in the near future (or at all). However! I do personally agree that it’s quite unfair for the Creative community to miss out on the cosmetic features, such as holiday tags, chat colours and other cosmetic perks.
I think it would be a great, and beneficial idea for both the players and Dakota, to temporarily add the holiday tags to the creative store whilst the crates are available.